I do a shoddy and half-assed teardown of one of these 2015 IKEA LEDARE 600 lumen bulbs. I don't pull the ballast out as for some reason I didn't feel like ruining a perfectly good bulb... But I look at the board construction and thermal management.

Construction appears to be decent on this especially considering the price. Will they last? Only time will tell but for the price I paid on sale ($2.25 each) they were really a steal.

Using a thermocouple I measured chip temperature at 73C and the metal surface where the circuit board mounts gets to about 49C. What is interesting is the exterior of the bulb (the white part) seems to get hotter than the metal tower the LED board is on. I measured that at 58C. I could verify this by feel as well (before it had heated up to such a high temperature.

This is with the dome removed and lamp installed in the IKEA Desk lamp seen in the video. An enclosed lamp would definitely push it to higher temperatures.

I was able to identify that each LED has two chips inside.

LUX measured: 1230 without the light guide installed (but dome installed) vs 918 as stock. Same exact bulb facing down in my IKEA desk lamp seen in this video or about 32% more LUX output in the downward direction. (In THIS lamp only.) This is a worthwhile mod if this is how you are using this light. Turns it into a much more "spot" style bulb.

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